\begin{myenv}
  \part{main title} part body\chapter{\emph{emphasise}title text} body text body text \section{section text} section body \section{section text} section body \subsection{sub title}subsection body subsection body\subsubsection{subsub section title}subsubsubsubsubsubsub\chapter{second chapter} chapter body chapter body\part{another part} more parts!\chapter{more chapter! :)}some mathematics: \[x^2\]\subsection{and some section}to wrap things up
\end{myenv}
